Finally, I've finished and uploaded a number of combined Adventures of Superman arcs.
A couple of things:
First, not all of the surviving arcs are there. There are four or five not there, simply because the original files wouldn't let me combine them.
Secondly, I combined the early arcs designated by James Lantz at the radio portion of the Superman Homepage. That is, his Origins of Superman, The North Star Mining Company Mystery and The Mystery of Dyerville. Other than the 'Lantz' designations, none of the stand-alone, single episodes are included in this set.
Thirdly, none of the "segues" are included, so there may be cases where the very first 5 minutes of so of the arcs are missing (although, those are rare.)
And lastly, I found (through OTRR) a couple of files that help complete arcs that you can't complete on archive.org. They are designated with the word, "complete."